The Golden Eagle (Aquila chrysaetos) ring recoveries according the trail camera study in Estonia Определение возврата колец беркута при использовании фотоловушек в Эстонии Gunnar Sein ESTONIA
Purposes of presentation • Introduce you some basic ringing numbers of Golden Eagle in Estonia • Demonstrate preliminary trail cameras study results • Share my experiences of using trail cameras
Historical preview of Golden Eagle ringing in Estonia (according the Ringing Center of Estonia - 20.09.2016) • First Golden Eagle was ringed in Estonia at 1941? • Altogether 100 aluminium rings are used until 2002 • Coloured ringing program started at 1997. Until today we have used 180 coloured rings. (right leg green (Estonian) ring and left leg year ring) • Until the end of 2015 we have got 22 aluminium recoveries and 32 coloured ring recoveries?
Basic data from trail cameras 2011-2015 • 45 trail cameras were set up with 5 years • 32 cameras in winter,13 cameras in summer • Cameras were set up in 31 different territories, which make 70 % of all the known territories from the last 5 years
Trail camera setup basic data • Purposes: a) ring recovery, b) phenology of breeding, c) food • Winter trail cameras were put up in February, summer trail cameras in June • Program setup: Buschnell camera 1 photo after 10 minute size of photo 5 MB. in winter additional battery. camera was from nest 1.20-1.50 m far away
Nest occupancy of winter cameras (N=32)
Results • From 45 were observed 58 individuals
Why the rings are not readable? • 27 recoveries - 5 bird with aluminium, 22 bird with coloureds rings from which were possible read the ring number only in 6 cases!!! • All coloureds rings were the Estonian ones (N=22)
Recoveries Имя Год гнездовой кольцеван территории ия
Возраст Дистанци обнаружени я я
Öördi
2003
10
63
Keava
2005
8
78
Mahtra
2007
8
93
Leidissoo
2005
9
55
Linnuraba
2013
2
80
Lõõla
2006
9
84
L-Suursoo
2008
7
Alaka
2002
11
Возраст обнаружени я
Дистанци я
Min
2
24
70
Max
11
93
24
Median
8
74
Finally Today we estimate our Golden Eagle population size up to 65 pairs Through last 5 years we know 44 pair occupied nests Trail cameras were set up to the 31 nests 6 cases were nests not occupied 25 nests were observed at least one eagle In 17 nests from 25 were observed at least one eagle with coloured ring (22 individuals) • It make almost 50 % of individuals from observed nests where were observed eagles, carry coloured rings
• • • • • •
• It mean that last decades population increase in Estonia have been done mostly by our own Golden Eagles
Finally • The reasons of population increasing – long period effective protection status a) Golden Eagle took under the protection year of 1935 b) Flexible protection methods outside protected areas nowadays - temporary automatic 500 m radius protection zone - seasonal moving forbiddance - finally all temporary protection zones will chance to the natural borders small scale protected areas
Thank you!